The Quasi JX is a new car model. Under ideal driving conditions, the Quasi JX's fuel economy is E kilometers per liter(E km/l) when its driving speed is constant at S kilometers per hour (S km/h).
In terms of the variables S and E, select the expression that represents the number of liters of fuel used in 1 hour of driving under ideal driving conditions at a constant speed S, and select the expression that represents the number of liters of fuel used in a 60 km drive under Ideal driving conditions at a constant speed S. Make only two selections, one in each column.
1. Liters of fuel in 60 km = ?
A. S/E B. E/S C. 60/E D. 60/S E. E/60
2. Liters of fuel in 1 h = ?
A. S/E B. E/S C. 60/E D. 60/S E. E/60
正确答案：
C A
解题思路：
一升可以走E千米，即1 (L)=E (K);一小时可以走S千米，即1 (h)=S (K)
问题1：60千米耗油数量=60/E
问题2:1小时耗油量=S/E
Over a period of 5 academic years from Fall 1999 through Spring 2004, the number of faculty at a certain college increased despite a decrease in student enrollment from 5,500 students in Fall 1999.
In the given expressions, F and S represent the percent change in the number of faculty and students, respectively, over the 5 academic years,
and R represents the number of students per faculty member in Fall 1999. The percent change in a quantity X is calculated using the formula
Select the expression that represents the number of faculty in Fall 1999, and select the expression that represents the number of students per faculty member in Spring 2004. Make only two selections, one in each column.
1. Students per faculty member in Spring 2004
A. 5500R B. 5500/R C. 1/R D. (100+S)/(100+F)*R E. (100-S)/(100+F)*R F. (100+F)/(100-S)*R
2. Number of faculty in Fall 1999
A. 5500R B. 5500/R C. 1/R D. (100+S)/(100+F)*R E. (100-S)/(100+F)*R F. (100+F)/(100-S)*R
正确答案：
B D
解题思路：
1. 1999年有5500个学生，R是1999年的平均每个系的学生，故R=5500/系数量，即系数量=5500/R
2. 从定义上，R=学生数/系数量，故2004年的新R/1999年的R=(1+S%)/(1+F%)，移项得到新的R=(100+S)/(100+F)*R
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